smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available
In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted recv_io and granted credits is racy. That's because the peer might already consumed a credit, but between receiving the incoming recv at the hardware and processing the completion in the 'recv_done' functions we likely have a window where we grant credits, which don't really exist. So we better have a decicated counter for the available credits, which will be incremented when we posted new recv buffers and drained when we grant the credits to the peer.
CVE-2026-31539
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31539
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5fb9b459b3686e366640edd4e62805ef7b4de927",
"lessThan": "e811e60e1cc79923c4388146eb1fa26a7482731e",
"versionType": "git"
},
{
"status": "affected",
"version": "5fb9b459b3686e366640edd4e62805ef7b4de927",
"lessThan": "f99996870222b598914a1f49d7375dc23752c237",
"versionType": "git"
},
{
"status": "affected",
"version": "5fb9b459b3686e366640edd4e62805ef7b4de927",
"lessThan": "6e3c5052f9686192e178806e017b7377155f4bab",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/common/smbdirect/smbdirect_socket.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.11",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.1",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/common/smbdirect/smbdirect_socket.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31539
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39920 · Revision 1
- Added to Heist Feed
- Publisher date